US3789713A - Apparatus for slitting seamless flattened tubes of plastics film - Google Patents

Apparatus for slitting seamless flattened tubes of plastics film Download PDF

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Publication number
US3789713A
US3789713A US00257546A US3789713DA US3789713A US 3789713 A US3789713 A US 3789713A US 00257546 A US00257546 A US 00257546A US 3789713D A US3789713D A US 3789713DA US 3789713 A US3789713 A US 3789713A
Authority
US
United States
Prior art keywords
tube
cutting device
slitting
flattened
rollers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00257546A
Other languages
English (en)
Inventor
R Peters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Application granted granted Critical
Publication of US3789713A publication Critical patent/US3789713A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/001—Cutting tubes longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/355—Conveyors for extruded articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0596—Cutting wall of hollow work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/384—By tool inside hollow work
    • Y10T83/391—With means to position tool[s] for cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6476—Including means to move work from one tool station to another
    • Y10T83/6489—Slitter station
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6584—Cut made parallel to direction of and during work movement
    • Y10T83/6635—By feed roller
    • Y10T83/6636—Pinch rollers

Definitions

  • An apparatus for slitting a longitudinally fed flattened tube of plastics film comprises a cutting device for forming longitudinal incisions in both walls of the tube near one longitudinal edge thereof, temporarily operative means downstream of the cutting device for separating the tube walls at the longitudinal incisions, and a slitting knife which is disposed downstream of the cutting device in the medial plane of the tube, is
  • the invention aims to provide a slitting apparatus which can'be located downstream of the machinery for making the tubular film and comprises at least one slit ting knife'which can be reliably introduced in the flattened tubular film by only one operator.
  • a margin of the flattened tube is cut off temporarily during continued feeding of the tube and atthese cut edges the opening means can separate the tube walls to permit introduction of the slitting knife. Subsequently, the cutting device is made inoperative again but by this time the slitting knife is located inside the folded tube and continof material.
  • Thetube opening means preferably comprise'a pair of rollers which have an adhesive peripheral surface and are adapted to 'be brought into contact with the tube sides.
  • Such opening means are simple and will provide an opening of adequate size for introduction of the slittingknife in so far that the rollers are set into rotation under the friction of the film moving therebetween 2 and the tube walls adhere to the rollers and are temporarily deflected to separate from one another.
  • peripheral surfaces of the rollers may be made adhesive with the aid of a film of adhesive but. the same effect can be brought about with the aid of suction means.
  • the rollers are springbiassed to an inoperative position at which they are out of contact with the tube. This will avoid damage of the film by the rollers and the associated cutting device after the slitting knife has been introduced in the tube.
  • the cutting device and tube opening means may together be adjustable on a cross-member. This saves time when the apparatus is resetto operate on a tubular film of different size.
  • FIG. 1 is a sectional side elevation of a slitting apparatus taken on the line I--I in FIG. 2, and
  • FIG. 2 is a diagrammatic plan view of the apparatus.
  • the slitting apparatus comprises a slitting knife 1 adjustably carried by a mounting 3 on a machine frame 2.
  • the knife 1 serves to slit open a tubular plastics film 4 which is flattened to formside walls 5 and 6.
  • the end 7 of the knife 1 is located between the walls 5 and 6 of the tube so that the latter, which is continually fed in the direction of the arrow indicated in FIG. 2, runs up onto the cutting edge 9 of the knife 1 and is slit open at one longitudinal folded edge.
  • the slitting knife 1 Before the slitting knife 1 is introduced in the tube, it is located to one side of the tube in a plane spaced a small distance from the medial plane of the flattened tube and thus at this stage the tube does not make contact with the knife.
  • Means are provided for temporarily producing a marginal incision 10 through both walls 5, 6 of the tube 4. These means are located upstream of the knife 1 in the vicinity of a direction-changing roll 12 for the tube, the roll 12 being rotatable about a shaft 11. More particularly, there is a cutting blade 13 carried by a bracket 14 on a pivotable hand lever 15. The lever 15 is mounted in a blockl6 which is adjustable along a cross-member l7 fixed to the frame 2.
  • the underside of the block 16 carries a cylindrical pin 18.which supports mountingsl9, 20 for rotatable opening rollers 21, 21' respectively.
  • the mounting 19 is longitudinally displaceable along the pin 18 and is.
  • the opening roller 21 is therefore simultaneously lowered towards the flattened tube 4.
  • the roller 21' is at a small spacing from the tube 4 in a position determined by the location of the mounting 20 on the pin 18 and therefore limits the amount of deflection of the tube 4 as the roller 21 is lowered onto it.
  • the two rol-, lers 21, 21 are rotated under friction by the tube 4 that is clamped therebetween. At their peripheral surfaces, the rollers are provided with a film of adhesive.
  • a compression spring 23 is interposed between the mountings 19 and 20 for the opening rollers. This spring is stressed when the lever 15 is depressed and, after the incision has been formed and the lever is released, the spring will move the lever 15 and the roller 21 to an inoperative position.
  • Apparatus for slitting seamless flattened tubes of plastics film which is being fed longitudinally comprising at least one slitting knife disposed substantially in the medial plane of the flattened tube so as to cut the tube along a fold line at one longitudinal edge, a temporarily operative cutting device upstream of the slitting knife for longitudinally incising the tube perpendicular 4 to said medial plane at a margin containing said fold line, and means interposed between the cutting device and slitting knife for temporarily opening the flattened tube at the longitudinal incisions formed by the cutting device whereby to facilitate introduction of the slitting knife in the tube.
  • the tube opening means comprise a pair of rollers which have an adhesive peripheral surface and are adapted to be brought into contact with the tube sides.
  • rollers are spring-biassed to an inoperative position at which they are out of contact with the tube.
  • Apparatus according to claim 1 including a further said slitting knife, cutting device and tube opening means operative at the fold line of the opposite longitudinal edge of the flattened tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Making Paper Articles (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Details Of Cutting Devices (AREA)
US00257546A 1971-06-08 1972-05-30 Apparatus for slitting seamless flattened tubes of plastics film Expired - Lifetime US3789713A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2128534A DE2128534C3 (de) 1971-06-08 1971-06-08 Vorrichtung zum Auftrennen flachgelegter nahtloser Kunststoffolienschläuche

Publications (1)

Publication Number Publication Date
US3789713A true US3789713A (en) 1974-02-05

Family

ID=5810231

Family Applications (1)

Application Number Title Priority Date Filing Date
US00257546A Expired - Lifetime US3789713A (en) 1971-06-08 1972-05-30 Apparatus for slitting seamless flattened tubes of plastics film

Country Status (7)

Country Link
US (1) US3789713A (de)
BR (1) BR7203555D0 (de)
CH (1) CH538346A (de)
DE (1) DE2128534C3 (de)
FR (1) FR2140386B1 (de)
GB (1) GB1319219A (de)
IT (1) IT955512B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345497A (en) * 1980-09-18 1982-08-24 Professional Marketing Associates Film slitter
US20160031113A1 (en) * 2013-03-11 2016-02-04 Windmöller & Hölscher Kg Device for separating a tubular web
WO2020201155A3 (de) * 2019-03-29 2020-11-26 Windmöller & Hölscher Kg System zur verbesserten einführung einer trennvorrichtung sowie blasfolienanlage sowie verfahren zur herstellung und bereitstellung von zumindest zwei folienbahnen aus kunststoff in einer blasfolienanlage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019215837A1 (de) * 2019-10-15 2021-04-15 Windmöller & Hölscher Kg Verbindungs-, Trenneinheit für Folienbahnen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB692708A (en) * 1950-04-04 1953-06-10 Valcovny Trub Method of and means for producing slots in tubing
GB777886A (en) * 1955-04-22 1957-06-26 Ici Ltd Film slitting apparatus
US3068730A (en) * 1960-05-04 1962-12-18 Nat Distillers Chem Corp Apparatus for slitting tubular sheet materials
DE1178202B (de) * 1959-11-27 1964-09-17 Bemberg Ag Vorrichtung zum Herstellen von Flachfolien durch Aufschneiden von Schlauchfolien

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB692708A (en) * 1950-04-04 1953-06-10 Valcovny Trub Method of and means for producing slots in tubing
GB777886A (en) * 1955-04-22 1957-06-26 Ici Ltd Film slitting apparatus
DE1178202B (de) * 1959-11-27 1964-09-17 Bemberg Ag Vorrichtung zum Herstellen von Flachfolien durch Aufschneiden von Schlauchfolien
US3068730A (en) * 1960-05-04 1962-12-18 Nat Distillers Chem Corp Apparatus for slitting tubular sheet materials

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345497A (en) * 1980-09-18 1982-08-24 Professional Marketing Associates Film slitter
US20160031113A1 (en) * 2013-03-11 2016-02-04 Windmöller & Hölscher Kg Device for separating a tubular web
US10882204B2 (en) * 2013-03-11 2021-01-05 Windmöller & Hölscher Kg Device for separating a tubular web
WO2020201155A3 (de) * 2019-03-29 2020-11-26 Windmöller & Hölscher Kg System zur verbesserten einführung einer trennvorrichtung sowie blasfolienanlage sowie verfahren zur herstellung und bereitstellung von zumindest zwei folienbahnen aus kunststoff in einer blasfolienanlage
CN113905861A (zh) * 2019-03-29 2022-01-07 温德默勒及霍乐沙两合公司 用于更好地引入分离装置的系统及膜吹塑设备以及用于在膜吹塑设备中制造并提供至少两个塑料膜幅材的方法
CN113905861B (zh) * 2019-03-29 2024-03-26 温德默勒及霍乐沙两合公司 用于引入分离装置的系统及膜吹塑设备以及该设备中制造并提供至少两个塑料膜幅材的方法
US12064910B2 (en) 2019-03-29 2024-08-20 Windmöller & Hölscher Kg System for the improved introduction of a separating device and blown film line, as well as a method for the production and supply of at least two plastic film webs in a blown film line

Also Published As

Publication number Publication date
DE2128534A1 (de) 1973-02-08
BR7203555D0 (pt) 1973-04-26
DE2128534B2 (de) 1973-06-20
FR2140386A1 (de) 1973-01-19
IT955512B (it) 1973-09-29
DE2128534C3 (de) 1974-01-24
CH538346A (de) 1973-06-30
GB1319219A (en) 1973-06-06
FR2140386B1 (de) 1975-10-24

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